This big roasting pan is an incredible value. The 18.5 x 14.75 pan is made entirely, bottom and sides, of a three-layer sandwich of aluminum and stainless steel. The aluminum core conducts heat quickly and evenly to all parts of the pan, eliminating hot spots that can burn food. The stainless-steel exterior and interior make the pan incredibly durable, scratch resistant and easy to care for, not to mention eliminating any interaction with food. The large handles make the pan easy to lift in and out of the oven with oven mitts and hot pads. This is a lifetime roasting pan at a very good price.